Publish modularized files

[wuct]

date-fp is published as a single build file, which forces consumers to required all functions in their bundles.

Maybe we can also release separated compiled-to-ES5 files, and consumers can required the only functions they need.

I would like to implement this if it looks good to you :)

[cullophid]

Sounds good.
We already have function specific es6 modules, so this should simply be a matter of compiling the files.

[cullophid]

#45